Computer Running Slow? How to Fix a Slow Windows 11 PC
Your PC takes three or four minutes to reach the desktop, the fan runs constantly, and clicking anything gives you the spinning blue circle. Slowness is the most common problem we get called about, and in most cases it is not a dying computer. It is usually too much software loading at startup, a drive that is nearly full, a mechanical hard drive that has reached the end of its useful life, or something running in the background that should not be there. Work through the checks below in order, because the early ones cost nothing and fix a surprising number of machines.
Start with a proper restart, not a shutdown
Windows 11 uses fast startup by default, which means a normal shutdown does not fully clear memory. A machine that has been closed and reopened for weeks builds up leaked memory and stuck processes. Restart is the only option that gives you a genuinely clean boot.
If the computer feels quicker for ten minutes after a restart and then crawls again, that points at a program or a driver rather than failing hardware, so keep reading.
- Click Start, then the power icon, then choose Restart rather than Shut down.
- Let the machine sit at the desktop for five minutes before judging the speed, because Windows finishes indexing and updating in that window.
- If the machine has not had a restart in over a week, make this a weekly habit.
Cut down what loads at startup
Almost every program you install adds itself to startup. Printer utilities, cloud storage clients, chat apps, game launchers and updaters all want to be running before you have opened anything. On a machine with 8GB of memory this alone can make the first few minutes after logging in unusable.
Turning off a startup item does not uninstall the program. You can still open it from the Start menu whenever you actually need it.
- Press Ctrl, Shift and Escape together to open Task Manager.
- Click Startup apps in the left sidebar.
- Sort by the Startup impact column so the heaviest items sit at the top.
- Right click anything you do not need the moment you log in and choose Disable. Safe candidates include Spotify, Steam, Epic Games, Adobe updaters and printer software.
- Leave your antivirus, audio driver, touchpad driver and OneDrive alone if you rely on them.
- Restart and see how the first two minutes feel.
Check whether the drive is the bottleneck
This is the biggest single cause of a slow older PC. A traditional spinning hard drive cannot keep up with modern Windows, and a machine that was fine a few years ago may now spend its whole life waiting on the disk. Task Manager will tell you honestly.
If the Disk column sits at or near 100 per cent while the processor is nearly idle, the drive is the problem. On a mechanical drive the fix is to fit a solid state drive, which is the most cost effective upgrade available and typically turns a two minute boot into something closer to fifteen seconds.
Free space matters too. Windows needs room to page memory to disk and to stage updates. Once a drive drops below roughly ten per cent free, everything slows down.
- Open Task Manager and stay on the Processes tab.
- Look at the percentages across the top for CPU, Memory and Disk.
- Click the Disk heading to sort, and note which process sits at the top.
- Open File Explorer, click This PC, and check the free space bar under your C drive.
- If space is tight, open Settings, then System, then Storage, and turn on Storage Sense to clear temporary files automatically.
Rule out overheating and thermal throttling
Laptops that live on a sofa, a bed or a lap pull cooling air through vents on the underside. Once those vents clog with dust and fibres the processor gets hot, and Windows deliberately slows it down to protect the hardware. The symptom is a machine that starts fine and gets steadily more sluggish, with a loud fan.
You can often confirm this without any tools. If the underside is uncomfortably warm and performance recovers after the machine has been off for an hour, heat is involved. A physical clean and fresh thermal paste restores full speed, and that is bench work rather than something anyone can do remotely.
- Use the laptop on a hard flat surface rather than fabric.
- Shine a torch into the vents and look for a felt like mat of dust.
- Open Settings, then System, then Power and battery, and set Power mode to Best performance while plugged in.
- If the fan is constantly loud and the case is hot, book a clean rather than buying software.
Clear out browser clutter and unwanted extensions
For a lot of people the computer is not slow, the browser is. Twenty open tabs, a couple of toolbars and a handful of extensions picked up alongside free downloads will eat memory faster than anything else on the machine. Coupon extensions and so called PC cleaners are the usual offenders.
Removing extensions you did not deliberately install is safe and reversible. If you find something you do not recognise, that is also a hint to run the malware checks in our virus removal guide.
- In Chrome or Edge, click the three dots menu, then Extensions, then Manage extensions.
- Remove anything you do not recognise or no longer use.
- Clear cached images and files from the last four weeks, but leave passwords and sign in data alone.
- Close tabs you are not using, or save them to a reading list instead of keeping them open.
When to get help
Startup cleanup, browser clutter, disk space, unwanted software and Windows settings are all things we fix remotely in a single session while you watch. We connect to your PC, you see everything we do, and nothing needs unplugged or carried anywhere.
What cannot be done remotely is anything physical. Fitting a solid state drive, adding memory, or stripping a laptop down for a proper clean all need the machine in front of us. If a remote session shows that the hardware is the limit, we will tell you that plainly rather than charge you for work that will not help. Remote support is no fix no fee, so if we cannot improve it you do not pay.
Frequently Asked Questions
How much faster will an SSD actually make my computer?
On a machine still running a mechanical hard drive the difference is dramatic. Boot times typically fall from a couple of minutes to under twenty seconds, and programs open almost immediately. For an older laptop or desktop it usually makes far more difference than adding memory.
Do PC cleaner and speed booster programs work?
Generally no. Most either duplicate tools already built into Windows or push you towards a subscription by reporting harmless registry entries as errors, and several arrive bundled with adware. Storage Sense and the Task Manager startup list are free, built in and safer.
Can you speed up my PC without deleting my files?
Yes. Everything in this guide, and everything in a standard remote tune up, leaves your documents, photos and email untouched. If a repair ever did require wiping the drive we would back your data up first and agree the plan with you before starting.
How long does a remote speed up session take?
Most take under an hour. We look at startup items, background processes, disk health, pending updates and any unwanted software, then explain what we found. If the cause turns out to be failing hardware we will say so during the session.
Let us fix it remotely
If you would rather not work through this yourself, we can connect to your computer over the internet and fix it while you watch. Most problems in this guide are sorted in a single session, and remote support is no fix no fee.
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